How to care for an injured axolotl?

I have an axolotl (Milton) in a community tank with some gold fish, and a Gourami. They all lived happily in my 75 gallon tank for several months. Today I get home after work to find my Gourami nipping at Milton's gills. It must have been happening all day because his gills are much less fluffy than they were before. I instantly removed him from the tank and put him in my 15 gallon tank upstairs with a few goldfish. He keeps going up for air and is currently perched lazily on some plants in the newly filled tank upstairs. Without most of his gills, is he going to suffocate? What special care will he need to insure he survives?

Please help! I am really worried about him.

PS: I would post pictures but he has moved while I was writing this and is now hiding in his cave.

They won't handle that sort of stress when injured.Removal of the fish, good care and time will fix it.Fish is simply nothing you should have in the same tank with them, it is a desaster waiting to happen :(

You biggest problem right now is oxygen as without the gills working properly the poor thing is required to use the undersized lungs, so make it easy to reach the water surface with a resting place close enough to the surface.